更新內容
-Upgrade Graphic and optimize for low device.
-Added Boss Hunter missions
-Added support mission , Sniper mission
-Unlock Events missions
-Change features for Gun
-Added over 200 missions
-Added more map
-Add facebook, connect with friends
-Added daily challegen
-Added daily login reward
-Added Google Play Cloud Save! Just sign in to Google Play Games to have your -progress be cloud saved – it will use the save with the longest play time.
-Fix minor bugs
